fieldfares breeding at Bridlington - Flock of 100 linnets

I stayed on the 21st to 24th April at Marton Grange guest house near Sewerby in Yorkshire and saw originally a pair of Fieldfares and later 5 fieldfares. Are they breeding here or are they just late in migrating? Also I saw over 100 what appeared to be linnets in a flock on the coast line near to RSPB Bempton cliffs. Do linnets flock in such large numbers at this time of year?